Re: [PATCH 0/3] dm-crypt: Adds support for wiping key when doing suspend/hibernation

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > > > > So proper way is to wipe luks crypto keys *after* userspace processes
> > > > > are freezed.
> > > > 
> > > > I know you believe that I'm just not accepting that at face value.
> > > 
> > > If disks are synced before any DM suspend operation then we have higher
> > > chance of preventing data corruption.
> > 
> > disks are already synced as part of the DM suspend operation!
> > 
> 
> Yes, but part of hibernate operation is also sync call.

Yes. Maybe that was a mistake.

> > > I still think that correct order is only:
> > > 
> > > * freeze processes (which doing continous I/O)
> > > * fs & disk sync
> > > * DM suspend
> > > * wipe crypto keys
> > > * enter hibernate
> > 
> > I just don't think that extreme is _required_ to have a hibernate/resume
> > that incorporates dm-crypt key wiping.
> 
> Ok, and what other developers think?

If someone can fix freezer to work with LUKS stopped, that would be a 
good thing. Can you do it, Mike? Then we can look if it works well
enough for Pali.

But that might be too hard / impossible. And at that point, I think
Pali's patch is right thing to do.
									Pavel
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